Question 1

Oxidation is the gain of electrons by an atom.

Accepted Answer

A) True 
 B)False  False

Question 2

What is the mass of 3.4 × 1020 molecules of ethanol (C2H6O)expressed in milligrams?

Accepted Answer

A)  0.026 mg of ethanol
B)  26,000 mg of ethanol
C)  0.012 mg of ethanol
D)  26 mg of ethanol D

Question 3

What is the formula weight of Co(NO3)3?

Accepted Answer

A)  88.94 amu
B)  244.96 amu
C)  216.94 amu
D)  148.96 amu
E)  196.96 amu B

Question 4

When the mass of a substance produced in a reaction must be calculated,first its number of moles is determined using mole ratios,and then Avogadro's number is used to convert moles to grams.

Accepted Answer

A) True 
 B)False

Question 5

Suppose the theoretical yield in a reaction is 10.5 g and the percent yield is 75.5%. What is the actual yield of product obtained?

Accepted Answer

A)  793 g
B)  7.93 g
C)  13.9 g
D)  0.139 g

Question 6

Consider the balanced reaction: 4 NO2 + O2 + 2 H2O → 4 HNO3. If 100. g of NO2 is placed in a reaction vessel the theoretical yield of nitric acid (HNO3)collected will be 137 g.

Accepted Answer

A) True 
 B)False

Question 7

Which reaction is a double displacement reaction?

Accepted Answer

A)  3 Mg + Fe2O3 → 2 Fe + 3 MgO
B)  2 KBr + Cl2 → 2 KCl + Br2
C)  2 H2 + O2 → 2 H2O
D)  3 Ca(OH) 2 + Al2(SO4) 3 → 3 CaSO4 + 2 Al(OH) 3

Question 8

In the balanced redox reaction: 2 C2H6(g)+ 7 O2(g)→ 4 CO2(g)+ 6 H2O(g),which species is oxidized?

Accepted Answer

A)  C2H6(g) 
B)  O2(g) 
C)  CO2(g) 
D)  H2O(g)

Question 9

Consider the oxidation of sodium metal to sodium oxide described by the balanced equation: 4 Na + O2 → 2 Na2O. If 2.55 mol of sodium reacts,and 75.0 g of Na2O is produced,what is the percent yield?

Accepted Answer

A)  94.9% yield
B)  34.0% yield
C)  47.5% yield
D)  190.% yield

Question 10

A chemical change alters the chemical composition of a substance,and therefore a new substance is produced.

Accepted Answer

A) True 
 B)False

Question 11

What is the formula weight of KCl?

Accepted Answer

A)  74.55 amu
B)  66.42 amu
C)  36.00 amu
D)  1386 amu

Question 12

Write a balanced chemical equation for the reaction of acetone (C3H6O)with oxygen (O2)to form carbon dioxide (CO2)and water (H2O).

Accepted Answer

A)  C3H6O + O2 → CO2 + H2O
B)  C3H6O + 4 O2 → 3 CO2 + 3 H2O
C)  3 CO2 + 3 H2O → C3H6O + 4 O2
D)  6 C3H6O + 8 O2 → 6 CO2 + 6 H2O

Question 13

The actual yield of a product in a chemical reaction should not exceed its theoretical yield.

Accepted Answer

A) True 
 B)False

Question 14

A mole of copper atoms has more atoms than a mole of lead atoms.

Accepted Answer

A) True 
 B)False

Question 15

In redox reactions,metals tend to undergo oxidation.

Accepted Answer

A) True 
 B)False

Question 16

A chemical equation is an expression that uses chemical formulas and other symbols to illustrate what ________ constitute the starting materials in a reaction and what ________ are formed.

Accepted Answer

The answer of A chemical equation is an expression that...

Question 17

Consider the mixture of Cl2 and F2 in a closed container as illustrated below. What will the contents of the container look like if the molecules undergo the reaction: Cl2(g)+ 3 F2(g)→ 2 ClF3(g)?

Accepted Answer

A)   2 and F2 in a closed container as illustrated below. What will the contents of the container look like if the molecules undergo the reaction: Cl2(g) + 3 F2(g) → 2 ClF3(g) ?   
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Question 18

Which chemical equation is properly balanced?

Accepted Answer

A)  SO2 + O2 + H2O → H2SO4
B)  2 SO2 + O2 + 2 H2O → 2 H2SO4
C)  SO2 + O2 + 4 H2O → 2 H2SO4
D)  4 SO2 + O2 + 4 H2O → 4 H2SO4

Question 19

A compound that gains electrons in a redox reaction while causing another compound to be oxidized is called a(n)________ agent.

Accepted Answer

The answer of A compound that gains electrons in a...

Question 20

Potassium metal (K)reacts violently when added to water according to the balanced equation: 2 K(s)+ 2 H2O(l)→ 2 KOH(aq)+ H2(g). How many moles of H2O are needed to react completely with 7.54 mol of K?

Accepted Answer

A)  2 mol of H2O
B)  7.54 mol of H2O
C)  15.1 mol of H2O
D)  3.77 mol of H2O

Exam 5: Chemical Reactions

Oxidation is the gain of electrons by an atom.

What is the mass of 3.4 × 10²⁰ molecules of ethanol (C₂H₆O) expressed in milligrams?

What is the formula weight of Co(NO₃) ₃?

When the mass of a substance produced in a reaction must be calculated,first its number of moles is determined using mole ratios,and then Avogadro's number is used to convert moles to grams.

Suppose the theoretical yield in a reaction is 10.5 g and the percent yield is 75.5%. What is the actual yield of product obtained?

Consider the balanced reaction: 4 NO₂ + O₂ + 2 H₂O → 4 HNO₃. If 100. g of NO₂ is placed in a reaction vessel the theoretical yield of nitric acid (HNO₃)collected will be 137 g.

Which reaction is a double displacement reaction?

In the balanced redox reaction: 2 C₂H₆(g) + 7 O₂(g) → 4 CO₂(g) + 6 H₂O(g) ,which species is oxidized?

Consider the oxidation of sodium metal to sodium oxide described by the balanced equation: 4 Na + O₂ → 2 Na₂O. If 2.55 mol of sodium reacts,and 75.0 g of Na₂O is produced,what is the percent yield?

A chemical change alters the chemical composition of a substance,and therefore a new substance is produced.

What is the formula weight of KCl?

Write a balanced chemical equation for the reaction of acetone (C₃H₆O) with oxygen (O₂) to form carbon dioxide (CO₂) and water (H₂O) .

The actual yield of a product in a chemical reaction should not exceed its theoretical yield.

A mole of copper atoms has more atoms than a mole of lead atoms.

In redox reactions,metals tend to undergo oxidation.

A chemical equation is an expression that uses chemical formulas and other symbols to illustrate what constitute the starting materials in a reaction and what are formed.

Consider the mixture of Cl₂ and F₂ in a closed container as illustrated below. What will the contents of the container look like if the molecules undergo the reaction: Cl₂(g) + 3 F₂(g) → 2 ClF₃(g) ?

Which chemical equation is properly balanced?

A compound that gains electrons in a redox reaction while causing another compound to be oxidized is called a(n)________ agent.

Potassium metal (K) reacts violently when added to water according to the balanced equation: 2 K(s) + 2 H₂O(l) → 2 KOH(aq) + H₂(g) . How many moles of H₂O are needed to react completely with 7.54 mol of K?

Exam 5: Chemical Reactions

Oxidation is the gain of electrons by an atom.

What is the mass of 3.4 × 1020 molecules of ethanol (C2H6O) expressed in milligrams?

What is the formula weight of Co(NO3) 3?

When the mass of a substance produced in a reaction must be calculated,first its number of moles is determined using mole ratios,and then Avogadro's number is used to convert moles to grams.

Suppose the theoretical yield in a reaction is 10.5 g and the percent yield is 75.5%. What is the actual yield of product obtained?

Consider the balanced reaction: 4 NO2 + O2 + 2 H2O → 4 HNO3. If 100. g of NO2 is placed in a reaction vessel the theoretical yield of nitric acid (HNO3)collected will be 137 g.

Which reaction is a double displacement reaction?

In the balanced redox reaction: 2 C2H6(g) + 7 O2(g) → 4 CO2(g) + 6 H2O(g) ,which species is oxidized?

Consider the oxidation of sodium metal to sodium oxide described by the balanced equation: 4 Na + O2 → 2 Na2O. If 2.55 mol of sodium reacts,and 75.0 g of Na2O is produced,what is the percent yield?

A chemical change alters the chemical composition of a substance,and therefore a new substance is produced.

What is the formula weight of KCl?

Write a balanced chemical equation for the reaction of acetone (C3H6O) with oxygen (O2) to form carbon dioxide (CO2) and water (H2O) .

The actual yield of a product in a chemical reaction should not exceed its theoretical yield.

A mole of copper atoms has more atoms than a mole of lead atoms.

In redox reactions,metals tend to undergo oxidation.

A chemical equation is an expression that uses chemical formulas and other symbols to illustrate what ________ constitute the starting materials in a reaction and what ________ are formed.

Consider the mixture of Cl2 and F2 in a closed container as illustrated below. What will the contents of the container look like if the molecules undergo the reaction: Cl2(g) + 3 F2(g) → 2 ClF3(g) ?

Which chemical equation is properly balanced?

A compound that gains electrons in a redox reaction while causing another compound to be oxidized is called a(n)________ agent.

Potassium metal (K) reacts violently when added to water according to the balanced equation: 2 K(s) + 2 H2O(l) → 2 KOH(aq) + H2(g) . How many moles of H2O are needed to react completely with 7.54 mol of K?

What is the mass of 3.4 × 10²⁰ molecules of ethanol (C₂H₆O) expressed in milligrams?

What is the formula weight of Co(NO₃) ₃?

Consider the balanced reaction: 4 NO₂ + O₂ + 2 H₂O → 4 HNO₃. If 100. g of NO₂ is placed in a reaction vessel the theoretical yield of nitric acid (HNO₃)collected will be 137 g.

In the balanced redox reaction: 2 C₂H₆(g) + 7 O₂(g) → 4 CO₂(g) + 6 H₂O(g) ,which species is oxidized?

Consider the oxidation of sodium metal to sodium oxide described by the balanced equation: 4 Na + O₂ → 2 Na₂O. If 2.55 mol of sodium reacts,and 75.0 g of Na₂O is produced,what is the percent yield?

Write a balanced chemical equation for the reaction of acetone (C₃H₆O) with oxygen (O₂) to form carbon dioxide (CO₂) and water (H₂O) .

A chemical equation is an expression that uses chemical formulas and other symbols to illustrate what constitute the starting materials in a reaction and what are formed.

Consider the mixture of Cl₂ and F₂ in a closed container as illustrated below. What will the contents of the container look like if the molecules undergo the reaction: Cl₂(g) + 3 F₂(g) → 2 ClF₃(g) ?

Potassium metal (K) reacts violently when added to water according to the balanced equation: 2 K(s) + 2 H₂O(l) → 2 KOH(aq) + H₂(g) . How many moles of H₂O are needed to react completely with 7.54 mol of K?